Pattress Socket Box Standard white bakelite box For use with single switches 1 Gang Size: 25mm Powermaster 1 Gang 25Mm Surface Pattress Box Single Socket Box | 1434-22 The Powermaster Pattress Box - 25mm 1 Gang is a standard white bakelite box. It is surface mounted. It is for use with single switches such as a 1 gang 2 way switch, as it is the medium depth surface mounted box. The pack contains one 1 gang pattress box and has hassle free, easy to open polyurethane packaging. It requires standard installation tools and should only be installed by a competent, qualified person. It conforms to BS standard 5733.